Tachometer drive



July 8, 1924 1,500,579

w. e. EAGER TACHOMETER DRIVE Filed Aug. 6, 1923 naac. L3

g'mcufc: M5 15 2552.

Patented July 8,1924.

attenracnomnrnn. :oarvn.

' Application filed August 6, 1923. Serial No. 656,068.

in View may be briefly summarized as follows 1st: To improve the drivingpulley ap:

plied to the car wheel axle by utilizing a split pulley having aplurality of grooves of like diameter to take care of axial movement ofthe axle and by providing radially adjustable centering pins which makepossible its accurate concentric mounting onv a tapering axle.

2nd: To provide a novel type of transmission pulley belted to the axlepulley and made up by assembling standard units of difi'erent diameterwhich will correspond to different diameters of the car Wheels drivingit, it being possible, by the use of different combinations of pulleyunits, to produce all of the various combination pulleys required from aminimum number of standard parts in stock. I

3rd: To simplify and perfect the drive from the transmission pulley tothe tachometer instrument, this being accomplished by a swiveled jointcoupling of a flexible shaft to the end of the transmission pulleyshaft, .to the end that the drive may be installed with theleastpossible expense both for time and material, and with the least possiblechange in the railway car to which it is applied.

The advantages of my-tachometer drive and the novel details of itsconstruction, which form a part of my present invention, will all bebest understood by reference to the accompanying drawings in which anillustrative embodiment of my invention is' disclosed.

According to the drawings:-:-

Fig. lis a side elevation of a railway car equipped withmy drive, partof the truck and part of the car body being broken away to more clearlyillustrate the drive.

Fig. 2 is a plan view enlarged of the drive,

as illustrated in Fig. 1.

'Fig. 3 is a detail view of the transmission pulley shaft showingin fulllines an assembly of pulley units for the medium size car wheels, thedotted lines showing pulleys which canbeassociated with the pulleysaccording to the diameters required for the larger or smaller car wheelstandards.

Figs. 4 and 5 are end and plan views in detlail of the driving pulleyfor the wheel ax e.

Similar reference numerals refer to similar parts throughout thedrawings.

In the embodiment of my invention illustrated, I show a railway car 1having a truck 2, standard car wheels 3, and an axle t which taperstowards each end and on which the wheels 3 are mounted. All of the partsthus far described maybe of any standard construction. On the axle 4; Imount a split pulley 5 having a multiple series of grooves of likediameter and having end abutting flanges 6 which are connected by bolts7 to connect the large end of the pulley about the axle 4:. At the otherend of the pulley is a flange 8 extending beyond the pulley proper. Iprovide in this flange three radial screws 9 set approximately 120 aparton the assembled pulley and adapted to be screwed in until they engagethe axle 4 and are in position to center the pulley thereon. Similarscrews 10 in pairs are mounted on the flanges 6. These screws 9 and 10thus take care of the decrease in diameter of the axle and enable thepulley to be properly centered thereon and hold it against slippage onthe axle.

15, 16, 17 18 and 19,which have successively and uniformly decreasingdiameters. The

pulley units are all similarly constructed except for their differencesin diameter, each having on one side an ofi'set hub boss 20 and on theopposite side a corresponding counres the t ree medium sized pulleys 16,17 and 18 as they would be arran ed on the shaft,

12. For the larger size 0 car wheels the pulley unit 15, would be addedand the unit 18 removed, the unit 17 being reversed so as to present itsboss 20 in position toabut the adjacent bearing. For the smallest wheeldiameters the pulley 19 would be added and the pulley 16 removed. Inthis manner I am enabled by stocking five sizes of pulley units to buildup transmission pulleys having all of the} different diameters whichwould be requiredin railroad service and I thus simplify the stocking ofparts and the application of. the drive'as much as possible. -On

. housing 22 and this serves to drive a chain 23 housed in'a flexibleshaft 24 and conmission one end of the shaft a swivel or universal drive(not shown) -is mounted in an angle nected-to the tachometer instrument25, suitably mounted in the car, so as to drive the: "rotating elementthereof, 1 1

Having assembled the apparatus in the manner described and havingselected and mounted the appropriate ,groupof transpulleys on the shaft12, say pulleys 16, 17 and. 18, the belt 11 is applied to the pulleys 5and 16 and the rotation thereby imparted to the shaft 12 is transmittedthrougha small floor opening by a flexible shaft 23, 24 totheinstrument, andthe latter will accurately indicate the speed, 'In'rounding curves-the lateral shifting movement-of the axle4 will be caredfor by the steelbelt 11 slipping from one to theother ofthe grooves inthe pulley 5, thus avoiding undue strain or wear on either of thepulleys which it connects. When tlle car wheel wears and its treadrequires to be turned down the practice is' to turn it down each i timeo'ne halfan inch, thereby reducing the diameter of the car wheel oneinch. When ley 18. In this "way without change or adjustment the machinewill always calibrate accu'rately.'

'ThoughI have described with great particularity the details of theembodiment of the invention herein shown, it is not to be construed thatI am limited thereto, as changes in arrangement. and substitution ofequivalents may be made by those skilled in the artwithout departingfromthe invention as, defined in the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is v 1. In a tachometer "drive, a multi-groovepulley of uniform diameter mounted on the car wheel axle, a drivenpulley mounted adjacent to the truck} center, a drive connecting saidpulleys, and a flexible drive shaft connecting said transmission pulleyand a tachometer, substantially as described.

2. A tachometer drive in accordance with claim 1, in which the elongatedpulley on the car wheel-axle is a splitpulley having adjustable means tocenter it on the axle.

3. A tachometer drive'in accordance with claim 1, in which the elongatedpulley is a split pulley havingat each end radial adjusting screws adated to engage the car wheel axle and b0 center and' -mount the pulleythereon. I

4. In a tachometer I with a pulley driven by a car wheel axle, of

drive, the combination a pulley shaftmounted on the truck nearitsp1vo.tal center, a flexible transmissionleadresponding hub. bosses onone side and hub receiving sockets on the other side. I

In testimony whereof I affix my signature.

comprlsing interchangeable elements which are reversible. and providedwith cor-- WILLIAM G. I EAGER.

